Lesson: Solve Systems by Substitution (part 1)
Presentation
•
Mathematics
•
9th Grade
•
Medium
+1
Standards-aligned
Christopher Gassler
Used 59+ times
FREE Resource
4 Slides • 6 Questions
1
Multiple Choice
YES I have my notebook out
No, I know it means a bad grade
2
Objective: Solve systems of equations by substitution
3
Math Response
Solve: 3x - 7(x - 4) = 24
4
It is simply two or more equations.
On the graph is ...
y = 2x + 1
y = -x + 7
To solve a system, you find the point where the lines intersect.
On this graph it is (2,5)
(more of the next slide)
5
Plug in to each equation.
y = 2x + 1
5 = 2(2) + 1
5 = 4 + 1
5 = 5
y = -x + 7
5 = -2 + 7
5 = 5
6
Solve the system: 2x - 3y = -1 and y = x - 1
7
Multiple Choice
When solving the system below, what would the second equation look like after you substitute 4x - 11 for y.
y=4x−11 and −4x+3y=−1
-4x + 3(4x - 11) = -1
-4(4x - 11) + 3y = -1
-4x + 3y = 4x - 11
8
Math Response
The Next Step, solve for x: −4x+3(4x−11)=−1
9
Multiple Choice
Given what we have done so far, solve the following system:
y=4x−11 and −4x+3y=−1
(4,−5)
(−4, 5)
(4,5)
(5,4)
(−5,4)
10
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MULTIPLE CHOICE
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